Magnetic Field Sensing Properties of CoFeB-MgO-CoFeB based Tunneling Magnetoresistance Devices

AbstractWe developed spin vale tunneling magnetoresistance devices based on CoFe-MgO-CoFeB materials capable of sensing magnetic field in wide range. The devices offer magnetic field range up to ±100 mT and down to ±0.4 mT, nonlinearity of 1% of full scale and ultra low hysteresis below 0.025% of full scale. In the largest field range devices show sensitivity up to 0.06%/mT and hysteresis below 0.025% of full scale, while in the lowest field range exhibit sensitivity up to 12%/mT and hysteresis below 2% of FS